Question

The sum of the first two terms of an increasing Geometric Progression (GP) is 20. The sum of the second tem and the third term of the same GP is 30. Determine the common ratio of the GP.

Answer 1

a, ar, ar² 
a + ar = 20....i
 ar+ ar2= 30...ii
ar( 1+r) = 30 
  a( 1+r)   20
r=1.5